Vat dyestuffs of the anthraquinone series and process of making same.



UNITED STATES PATENT OFFICE.

MAX HESSENLAND, OF H6CHST-ON-THE-MAIN, GEEMANY, ASSIGNOR'TG FARBWERKE VOBM. MEISTER LUCIUS & BRU'NING, OF flficHsT-oN THE-MAIN, GERMANY, A COR- PORATION F GERMANY.

VAll'. DYESTUFFS OF THE ANTHRAQUINONE SERIES AND PROCESS OF MAKING SAME.

1,047,940. No Drawing.

Specification of Letters Patent.

Patented Dec. 24, 1912.

Application tiled December 23, 1911. Serial No. 667,523.

To all whom it may concern:

' of the Anthraquinone Series and Processes of Making Same, of which the following is a specification.

Ihave found that valuable dyestuffs are obtained'by heating with caustic alkalis the acridones derived from dianthraquinonylamins.

The new dyestuifs are dark powders, insoluble in water, alcohol, ether and benzene,

soluble in concentrated sulfuric acid with a brown to violet color; they"- dissolve in alkaline hydrosulfite .with a brown color, and dye cotton gray to greenish-brown tints of great fastness.

Example: 150 ,parts of caustic potash are fused at l70-180 and there are gradually added, while stirring, 15 parts of l-anthra quinonyl fl: aminoanthraquinone 1.2 acridone obtained by combining t-aininoanthraquin0ne-1.2-acridone with l-chloranthraquinone (see U. S. Patent No. 1,002,270). The temperature is allowed to rise to 210 C. while stirring; the product of the reaction agglomerates and separates itself from the melt. It is dissolved in water and then thedyestuff is isolated by passing a current of air into the solution, or by the addition of an oxidizing agent. It forms a blackishbrown powder, insoluble in the usual sol vents such as alcohol, ether, benzene or the like, When, recrystallized from a-chlornaphthalene, it dissolves in concentrated. sulfuric acid with a reddish-violet color. The dyestufi yields with alkaline hydrosulfite a brown vat which dyescotton olivebrown tints of excellent fastness. In an analogous manner, similar dyestuffs can be obtained from other acrldones derived from dianthraquinonylamins, which may be syn-.

thesized in an analogous manner to that above mentioned.

Having now described my invention, what I claim is:

' 1. The process of manufacturing new vat dyestuffs, which consists in heating with caustic alkalis the acridones derived from dianthraquinonylamins.

2. As new products, the specified vat dyestufi's, derivatives of anthraquinonylaminoanthraquinone 1.2 acridones, obtainable by heating with a caustic alkali the acridones derived from dianthraquinonylamins, being dark powders, lnsoluble in water, al-

cohol, benzene, soluble in concentrated sul furlc acid with a brown to violet color,-

yielding when treated with alkaline hydrosulfite brown vats which dye cotton gray to a greenish-brown tints.

3. As a new product, the specified vat dyestufi, a derivative of l-anthraquinonyl- 4-aminoanthraquinone-1.2-acridone, obtainable by heating with a caustic alkali the 1 anthraquinonyl 4 aminoanthraquinone- 1.2-acridone, being a blackish-brown powder, insoluble in' water, alcohol, benzene,

dissolving in concentrated sulfuric acid after recrystallization from a-chlornaphtha- 'lene -with a reddish-violet color, yielding when treated with alkaline hydrosulfite a brown vat which dyes cotton olive-brown tints ofgreat fastness.

In testimony whereof, I afiix my signature in presence of two wltnesses.

Y .MAX HESSENLAND. Witnesses:

JEAN 'GRUND, I CARL GRUND. 

